HYDROTHERMAL ND METAMORPHIC BERTHIERINE FROM THE KIDD CREEK
Bibliographic record
Abstract
Berthierine, a 7 A pe-Al member of the serpentine group, occurs in the footwall stringer zone of the Archean Kidd Creek massive sulfide deposit, Ontario, associated with quartz, muscovite, chlorite, pyrite, sphalerite, chalcopyrite, and local tourmaline' cassiterite, and halloysite. Berthierine has been identified by the lack of 14 A basal reflections on X-ray powder diffractionpattems, by its composition (electron-microprobe data), and by transmission electron microscopy (TEM). Peoogaphic and scanning eiectron microscopic (SEM) studies reveal different types of berthierine occulrences, including interlayers within and rims on deformed chlorite, intergrowths with muscovite and halloysite, and discrete coarse grains. TEM images show thick packets of berthierine and chlorite that are parallel or related by low-angle boundaries, and layer terminations of chlorite by berthierine; mixedJayer chlorite-berthierine also is observed, intergrown with Fe-rich chlorite and berthierine. End-member (Mg-free) berthierine is present in small domains in two samples. The Kidd Creek berthierine is chemically similar to berthierine from other localities, and to Fe-rich chlorite from a variety of geological settings. This is the first reported occurence of berthierine from volcanogenic massive sulfide deposits. Textural relations suggest hat most of the Kidd Creek berthierine formed as a primary hydrothermal mineral at relatively high temperatures (*350"C) in the footwall stringer zone, probably by the replacement of a pie-existing aluminous phase such as muscovite or chlorite. However, the intergrowth textures observed by SEM and TEM suggest that some oftheberthierine originatedby syn- orpost-metamorphic replacement ofchlorite. The difficulty ofidentifying berthierine
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".